Musnad Abu Ya'la al-Mawsili 252:42

Al-Qawariri narrated to us, Bishr bin al-Mufaddal narrated to us, from Abd al-Rahman bin Ishaq, Abd al-Rahman bin Mu'awiyah narrated to us, from Ibn Abi Dhubab, from Sahl bin Sa'd, who said: I did not see the Messenger of Allah, may Allah bless him and grant him peace, raising his hands in supplication upon a pulpit, nor upon anything else. However, I saw him saying it like this. And Abu Sa'id indicated with the index finger of his right hand, and he curved it.